One movie alone is more than many have in a far longer period of time. Not to mention the amount of different partners. Their characters are clearly insatiable, it's not a lifestyle for the wise and prudent.
Someone having a higher libido still wouldn't mean they're going to butt in on other peoples' monogamous relationships. Porn actors and actresses are still people outside of work that would still observe social niceties like not being jerks for literally no reason. Of course it's still up to the individual, maybe there are some jerks. But the point is that being in porn doesn't make them jerks.